/* Heemskerk Lab — static site styles */
:root{
  --ink:#1a2733;
  --muted:#5b6b7a;
  --accent:#0f766e;      /* teal */
  --accent-dark:#0b5851;
  --line:#e4e9ee;
  --bg:#ffffff;
  --bg-soft:#f6f8fa;
  --maxw:1320px;
  --radius:12px;
  --shadow:0 1px 3px rgba(16,32,48,.06), 0 8px 24px rgba(16,32,48,.05);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.65;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
h1,h2,h3{line-height:1.25;color:var(--ink);font-weight:700}
h1{font-size:1.8rem;margin:.2em 0 .4em}
h2{font-size:1.3rem;margin:1.8em 0 .6em}
h3{font-size:1.25rem;margin:1.4em 0 .4em}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}

/* Header */
.site-header{border-bottom:1px solid var(--line);background:var(--bg);position:sticky;top:0;z-index:20;backdrop-filter:saturate(180%) blur(6px)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:14px;padding-bottom:14px;flex-wrap:wrap}
.brand{display:flex;flex-direction:column;gap:2px}
.brand a{color:var(--ink);text-decoration:none}
.brand .name{font-weight:800;font-size:1.8rem;letter-spacing:-.02em}
.brand .tag{color:var(--muted);font-size:.82rem}
nav.main{display:flex;gap:4px;flex-wrap:wrap}
nav.main a{color:var(--muted);padding:7px 12px;border-radius:8px;font-size:.95rem;font-weight:500}
nav.main a:hover{color:var(--ink);background:var(--bg-soft);text-decoration:none}
nav.main a.active{color:var(--accent);background:rgba(15,118,110,.08)}

/* Hero */
.hero{background:linear-gradient(180deg,var(--bg-soft),var(--bg));border-bottom:1px solid var(--line)}
.hero .wrap{padding:56px 22px 40px}
.hero h1{font-size:2.4rem;letter-spacing:-.02em;max-width:20ch}
.hero p.lead{font-size:1.15rem;color:var(--muted);max-width:60ch;margin:.4em 0 0}

/* Sections */
main .wrap{padding:40px 22px 20px;display:flow-root}
.section-intro{color:var(--ink)}
.section-intro p{margin:0 0 1em}

/* Homepage slider */
.slider-outer{padding-top:28px}
.slider{position:relative;overflow:hidden;background:#0b1620;border-radius:var(--radius);box-shadow:var(--shadow);transition:height .35s ease}
.slide{position:absolute;inset:0;opacity:0;transition:opacity .8s ease}
.slide.active{opacity:1}
.slide img{width:100%;height:100%;object-fit:cover;display:block}
.slide::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(8,18,28,.72) 0%,rgba(8,18,28,.35) 45%,rgba(8,18,28,.05) 70%)}
.slide .caption{position:absolute;z-index:2;left:0;top:0;bottom:0;display:flex;flex-direction:column;justify-content:center;max-width:560px;padding:0 42px;color:#fff}
.slide .caption h2{color:#fff;font-size:1.9rem;margin:0 0 .4em;letter-spacing:-.01em;text-shadow:0 1px 3px rgba(0,0,0,.35)}
.slide .caption p{color:#eef3f6;font-size:1.02rem;margin:0 0 1.1em;text-shadow:0 1px 3px rgba(0,0,0,.35)}
.slide .caption .btn{display:inline-block;align-self:flex-start;background:var(--accent);color:#fff;padding:11px 22px;border-radius:8px;font-weight:600;font-size:.95rem}
.slide .caption .btn:hover{background:var(--accent-dark);text-decoration:none}
.slider .dots{position:absolute;z-index:3;left:0;right:0;bottom:16px;display:flex;gap:9px;justify-content:center}
.slider .dots button{width:34px;height:5px;border:none;border-radius:3px;background:rgba(255,255,255,.45);cursor:pointer;padding:0;transition:background .2s}
.slider .dots button.active{background:#fff}
.slider .arrow{position:absolute;z-index:3;top:50%;transform:translateY(-50%);background:rgba(0,0,0,.28);color:#fff;border:none;width:42px;height:42px;border-radius:50%;font-size:1.3rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .2s}
.slider .arrow:hover{background:rgba(0,0,0,.5)}
.slider .arrow.prev{left:12px}
.slider .arrow.next{right:12px}
@media (max-width:640px){
  .slider-outer{padding-top:16px}
  .slide .caption{padding:0 24px;max-width:100%}
  .slide .caption h2{font-size:1.4rem}
  .slide .caption p{font-size:.95rem}
  .slide::after{background:linear-gradient(90deg,rgba(8,18,28,.78),rgba(8,18,28,.45))}
  .slider .arrow{display:none}
}

/* Cards grid */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:22px;margin:28px 0}
.card{display:block;background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .15s ease,box-shadow .15s ease;color:var(--ink)}
.card:hover{transform:translateY(-3px);box-shadow:0 6px 14px rgba(16,32,48,.10),0 18px 40px rgba(16,32,48,.08)}
.card-link{display:block;color:inherit;text-decoration:none}
.card .thumb{aspect-ratio:16/10;overflow:hidden;background:var(--bg-soft)}
.card .thumb img{width:100%;height:100%;object-fit:cover}
.card .body{padding:16px 18px 20px}
.card h3{margin:.1em 0 .4em;font-size:1.08rem}
.card p{margin:0 0 .8em;color:var(--muted);font-size:.95rem}
.card p.venue{margin:0;padding:0 18px 18px;font-size:.85rem;color:var(--muted)}
.card p.venue a{color:var(--accent)}

/* Research themes */
.theme{padding:26px 0}
.theme .figure,.section-intro .figure{float:right;width:40%;max-width:420px;margin:4px 0 16px 26px}
.theme .figure.figure-lg{width:60%;max-width:630px}
.theme .figure figcaption{color:var(--muted);font-size:.85rem;font-style:italic;margin-top:6px}
.video-figure{width:40%;max-width:420px;float:right;margin:4px 0 16px 26px}
.video-embed{position:relative;width:100%;padding-top:78%;background:#000;border-radius:var(--radius);overflow:hidden}
.video-embed iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.eyebrow{color:var(--accent);font-weight:700;text-transform:uppercase;letter-spacing:.06em;font-size:.95rem;margin-bottom:4px}

/* Publications */
.pub-group{margin:12px 0 30px}
.pub-group h2{border-bottom:2px solid var(--accent);display:inline-block;padding-bottom:4px}
ul.pubs{list-style:none;margin:0;padding:0}
ul.pubs li{padding:14px 0;border-bottom:1px solid var(--line)}
ul.pubs li .title{font-weight:600}
ul.pubs li .authors{color:var(--muted);font-size:.92rem;margin-top:2px}
ul.pubs li .venue{color:var(--ink);font-size:.9rem;margin-top:2px}
ul.pubs li .venue em{color:var(--muted);font-style:normal}

/* Team */
.people{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:24px;margin:26px 0}
.person{text-align:center}
.person img{width:150px;height:150px;border-radius:50%;object-fit:cover;margin:0 auto 12px;box-shadow:var(--shadow);background:var(--bg-soft)}
.person .pname{font-weight:700}
.person .prole{color:var(--accent);font-size:.9rem}
.person .psub{color:var(--muted);font-size:.82rem}
.roster h2{margin-top:1.6em}
.roster ul{margin:.4em 0 1.2em;padding-left:1.1em;color:var(--ink)}
.roster ul li{margin:.2em 0}

/* Contact / callout */
.callout{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;margin:30px 0}
.callout p{margin:.2em 0}

/* Footer */
.site-footer{border-top:1px solid var(--line);margin-top:40px;background:var(--bg-soft)}
.site-footer .wrap{padding:26px 22px;color:var(--muted);font-size:.9rem;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.site-footer a{color:var(--muted)}

/* Gallery */
.gallery-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px;margin:28px 0}
.gallery-thumb{position:relative;aspect-ratio:1/1;border:none;padding:0;border-radius:var(--radius);overflow:hidden;cursor:pointer;background:var(--bg-soft);box-shadow:var(--shadow);transition:transform .15s ease}
.gallery-thumb:hover{transform:translateY(-3px)}
.gallery-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.lightbox{position:fixed;inset:0;background:rgba(10,16,22,.92);display:none;align-items:center;justify-content:center;z-index:100;padding:24px}
.lightbox.open{display:flex}
.lightbox figure{margin:0;max-width:90vw;max-height:90vh;display:flex;flex-direction:column;align-items:center}
.lightbox img{max-width:90vw;max-height:78vh;object-fit:contain;border-radius:8px}
.lightbox figcaption{color:#fff;text-align:center;margin-top:14px;font-size:.95rem;max-width:70ch}
.lightbox-close{position:absolute;top:18px;right:22px;background:none;border:none;color:#fff;font-size:2.2rem;line-height:1;cursor:pointer}
.lightbox-nav{position:absolute;top:50%;transform:translateY(-50%);background:rgba(255,255,255,.12);border:none;color:#fff;width:46px;height:46px;border-radius:50%;font-size:1.8rem;cursor:pointer;display:flex;align-items:center;justify-content:center}
.lightbox-nav:hover{background:rgba(255,255,255,.24)}
.lightbox-nav.prev{left:18px}
.lightbox-nav.next{right:18px}

@media (max-width:640px){
  body{font-size:15.5px}
  .hero .wrap{padding:40px 22px 30px}
  .hero h1{font-size:1.9rem}
  .person img{width:120px;height:120px}
  .theme .figure,.section-intro .figure{float:none;width:100%;max-width:100%;margin:12px 0}
  .gallery-grid{grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:8px}
  .lightbox-nav{width:38px;height:38px;font-size:1.4rem}
}